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In the company, let the number of girls be g and the number of boys be b
Then, 60% of g = 2b/3
3g/5 = 2b/3
9g = 10b
b/g = 9/10
Let b be 9a, then g = 10a
After going 40 new girls, 25% of (10a + 40) = 1*9a/3 = 3a
3a - 2.5a = 10
0.5a = 10
a = 20
Before joining the new girls, the strength of the company = 9a + 10a = 19a = 380
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